Back in March, long-time Plaxo President and CEO Ben Golubleft the social address book company after five years. Today, he’s announcing his next move — he’s taking the reins at Gluster, a startup that offers an open source software solution for storing very large amounts of unstructured data. Golub will replace current CEO Hitesh Chellani who is transitioning to become VP of Operations.

Golub says that during his time at Plaxo he experienced the struggles web companies have to go through to serve large amounts of data to large numbers of customers, which often involved quickly adding large amounts of storage capacity. He says that along with other Web 2.0 companies, large media companies like Comcast, which acquired Plaxo, have to deal with similar problems. Gluster helps deal with these issues, allowing services to use commodity hardware to store large amounts of data while also making it quickly retrievable (Gluster’s software will also work on enterprise-grade storage area networks). The software has been downloaded around 100,000 times.